WO1997035402A1 - Systeme proxy distant et procede - Google Patents

Systeme proxy distant et procede Download PDF

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Publication number
WO1997035402A1
WO1997035402A1 PCT/US1996/003909 US9603909W WO9735402A1 WO 1997035402 A1 WO1997035402 A1 WO 1997035402A1 US 9603909 W US9603909 W US 9603909W WO 9735402 A1 WO9735402 A1 WO 9735402A1
Authority
WO
WIPO (PCT)
Prior art keywords
network
proxy
computer
computer network
local proxy
Prior art date
Application number
PCT/US1996/003909
Other languages
English (en)
Inventor
David Matthew Pepe
Lisa B. Blitzer
James Joseph Brockman
William Cruz
Dwight Omar Hakim
Richard Reid Hovey
Michael Kramer
Dawn Diane Petr
Josefa Ramaroson
Gerardo Ramirez
Yang-Wei Wang
Robert G. White
Original Assignee
Bell Communications Research, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bell Communications Research, Inc. filed Critical Bell Communications Research, Inc.
Priority to AU55256/96A priority Critical patent/AU707755B2/en
Priority to CA002247536A priority patent/CA2247536C/fr
Priority to EP96912438A priority patent/EP0885501A4/fr
Priority to JP9533423A priority patent/JPH11507152A/ja
Publication of WO1997035402A1 publication Critical patent/WO1997035402A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/02—Network architectures or network communication protocols for network security for separating internal from external traffic, e.g. firewalls
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/56—Provisioning of proxy services
    • H04L67/565—Conversion or adaptation of application format or content
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
    • H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/2866—Architectures; Arrangements
    • H04L67/2876—Pairs of inter-processing entities at each side of the network, e.g. split proxies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/56—Provisioning of proxy services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/08—Protocols for interworking; Protocol conversion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H04L69/165—Combined use of TCP and UDP protocols; selection criteria therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/20—Information technology specific aspects, e.g. CAD, simulation, modelling, system security

Definitions

  • the present invention relates to an improved interface between private computers or private computer networks and the World Wide Web (WWW) using both
  • the invention relates to an improved WWW interface with protocol translation, security and automatic configuring features. Description of the Related Art
  • a firewall is commonly a specific piece of hardware and/or software bridging the connection between a private computer or computer network (LAN) 10 and the WWW 12.
  • the main purpose of a firewall is to screen data traffic into and out of the network that is to be protected. If a network intruder is detected, the firewall has the capability of sifting through the data traffic and disabling the intruder's access.
  • the firewalls needed more intelligence about application data traversing a firewall so that desirable traffic was not hindered.
  • proxies are computer processes that completely understand specific applications like an FTP application. It became a straightforward matter for network administrators to add multiple proxies to the firewall system based on the type of applications the internal corporate users wanted to execute. For example, WWW browsers (described below) would use a Hyper Text Transport Protocol (HTTP) proxy to transfer Hyper Text Markup Language (HTML) documents.
  • HTTP Hyper Text Transport Protocol
  • Browsers such as the popular NetscapeTM and MosaicTM browsers, allow WWW users to browse
  • Patent Application Serial No. 08/309,336 (hereinafter "the '336 application), provides users on computer networks with a consistent means to access a variety of media in a simplified fashion. Making use of browsing software, the invention of the '336 application has changed the way people view and create information - it has created the first true global hypermedia network.
  • one responsibility of an HTTP proxy is to receive requests from browsers or software applications 6 within the protected network 10 and relay those requests to the www 12. The proxy also monitors access to the protected computer or network 10 from the WWW 12.
  • the proxy also monitors access to the protected computer or network 10 from the WWW 12.
  • This proxy-driven firewall 2, 4 allows corporations and those with similar concerns to make use of the valuable resources of the WWW 12 while
  • a protocol organizes data to be transmitted over the WWW in a standard way recognizable by the receiving computer.
  • OSI open systems interconnection
  • Each layer adds additional organizational capabilities that facilitate the transmission of data.
  • IP Internet Protocol
  • TCP Transmission Control Protocol
  • ISP Internet Service Providers
  • wireless networks include cellular digital packet data (CDPD, provided by cellular carriers), circuit-switched cellular networks, such as the MobitexTM network (provided by RAM Mobile data in the U.S.), the ArdisTM network, and a host of emerging national wireless data providers.
  • CDPD cellular digital packet data
  • MobitexTM provided by RAM Mobile data in the U.S.
  • ArdisTM the ArdisTM network
  • IP Internet Protocol
  • the first problem is caused by data latency
  • Data latency refers to the time delays created by multiple hops and slow links as data travels across various nodes within the WWW. This particular problem is exacerbated when the www is accessed using a wireless modem. Most wide area wireless, and some wireline, data networks were not originally designed to support the TCP/IP protocol.
  • Latencies are increased even further by encapsulating IP data into the networks' original data protocols.
  • TCP When TCP is organizing data for transmission over the WWW, it breaks the data into discrete "packets" of information. TCP then transmits the individual packets. Each packet includes instructions to the receiving system for reassembling the packets into the complete data structure being transmitted. Each packet also includes a cyclic redundancy check that allows the receiving system to check that the packet was not corrupted or broken up during transmission.
  • TCP is typically configured to transmit a number of packets and then wait for a confirmation from the receiving system that the packets have been received properly.
  • the amount of time required to transmit a data packet and receive confirmation of its arrival is known as the "latency" of the system.
  • TCP does not receive confirmation that the data packet was properly received, it will assume that the packet was lost during transmission and re-transmit the packet. If the latency of the system gets too high, TCP will assume, prematurely, that the packet was lost and flood the network with re-transmissions of the same data packets before the original packets reach their
  • TCP cannot operate properly over a connection with a high latency. If the latency of the system exceeds approximately 3 to 5 seconds, TCP will begin to
  • the TCP datagram When the WWW is accessed over standard phone lines that do not support TCP, the TCP datagram must be encapsulated (i.e., translated) into a form that can be sent over the telephone line. The datagram is then unpacked and used by the receiving computer. While this approach works, it adds to the latency of the
  • a further problem with accessing the www using a wireless modem is the increased latencies that are introduced by the wireless network.
  • a general trend is the wider the area served by a wireless data network, the lower the bandwidth (in bps) of the transmission.
  • present wireless communication systems in use in the United States are capable of transmitting 4,800 bits of data per second. This results in
  • compression entails decreasing the size of transmissions of data over the network without changing the content of the information.
  • Most proposals for compression support require external utilities from the browser to
  • MIMS Multipurpose Internet Mail Extension
  • Encryption is the coding of data transmissions.
  • Encryption helps to provide security since encrypted data transmissions are much more difficult for an unauthorized party to intercept and access.
  • Socket Layer (SSL)
  • SSL Socket Layer
  • the filtering referred to here is a global safety net for unwary users that could potentially misuse a wireless/low-bandwidth data network by requesting too much data, retrieving spurious information, or some other unwanted side effect resulting from a WWW request.
  • a user may request a data object from the WWW that a user is not aware is extremely large, and perhaps costly, to transmit.
  • the user may configure a filter to automatically prevent a particular request from being executed.
  • Existing browser technology is client based.
  • the most popular browsers, such as the NetscapeTM, MosaicTM, LynxTM browsers, as well as other less popular browsers, require users to initiate some form of request before response data will be delivered to the respective browser.
  • system and method of the present invention may utilize a host computer having a browser and a local proxy in a first location, a remote proxy in a second location in
  • system and method of the present invention include means for communicating the query to a network server, executing the query, and returning a data object to the remote proxy, means for converting the data object into a transport protocol suitable for transmission over the low-bandwidth
  • system and method of the present invention include means for creating a query script having settings for compression, filtering, and encryption, means for encapsulating the query script for transmission over the low-bandwidth network from the local proxy to the remote proxy, means for compressing, filtering, and encrypting the data object according to the settings in the query script, and means for placing the data object in a reply script for transmission over the low-bandwidth network from the remote proxy to the local proxy.
  • the system of the present invention may also comprise a system for communicating with a computer network, comprising a host computer having a browser for a user interface, a local proxy means for communicating with the browser using an application layer protocol, the local proxy means having means for converting the application layer protocol into a transport protocol, and a remote proxy means for communicating with the local proxy means using the transport protocol.
  • the remote proxy means includes means for converting the transport protocol into the application layer protocol, and means for communicating with the computer network using the application layer protocol.
  • Fig. l is a block diagram showing the related art firewall interface between a private computer network and the www.
  • Fig. 2 is a block diagram showing the split proxy interface of the present invention.
  • Fig. 3 is a schematic diagram of the protocol translation performed by the local proxy interface of the present invention.
  • Fig. 4 is a schematic diagram of the protocol translation performed by the remote proxy interface of the present invention.
  • Fig. 5 is a flow chart showing the implementation of the proxy interface of the present invention.
  • the creation of the WWW is a computing revolution which also offers a potential catalyst for wireless data networks to become a direct participant in exploding
  • the present invention provides a method and system for interfacing a private computer or private computer network with the WWW which provides support for TCP/IP in a high-latency environment;
  • the present invention also allows a Laptop or Personal Digital
  • PDA Personal User Equipment
  • the interface to the WWW of the present invention may be implemented by modifying a proxy.
  • the modified proxy would become a system of split proxies (sometimes referred to as Agent
  • a split proxy comprises a local proxy 56 and a remote proxy 66, which are software modules that enable translation and
  • a user operating a mobile terminal 52 is using a web browser 54 which communicates with the WWW using TCP/IP.
  • the local proxy 56 is a software package that runs in the background on the user terminal 52. Where high latency is a problem, the local proxy 56, according to the principles of the present invention, will translate data requests/transmissions between the TCP/IP protocol used by the browser and a protocol robust enough to carry data across the communication network to the remote proxy.
  • the user is accessing the WWW through a wireless network.
  • a wireless modem 58 uses a low-bandwidth optimized protocol, such as AirBossTM Wireless Transport Protocol, to communicate with base station 60.
  • AirBossTM Wireless Transport Protocol such as AirBossTM Wireless Transport Protocol
  • the local proxy's encapsulated request script (see Fig. 5 - General Browser Usage Flow), is transmitted through a wireless network 62 to the remote proxy 66.
  • the remote proxy 66 makes the necessary protocol
  • the present invention provides several methods by which standard web browsers that support proxy services can be adapted for wireless and low-bandwidth web browsing.
  • the present invention will be explained by describing three sets of methods, which relate to the first, second, and third problems described above, respectively.
  • Protocol translation refers to encapsulating TCP application requests that have a single request/response pair (i.e., HTTP, SMTP, Gopher, and WAIS) into a
  • connection-oriented protocol robust enough to function in the high latencies encountered over
  • communication networks particularly wireless and other low-bandwidth networks, that transmit the data.
  • the protocol translation is achieved by the split proxy.
  • the local proxy is started on the host where a user also initiates a standard web browser.
  • the web browser is configured, either by the user or the local proxy, to communicate with the local proxy.
  • the latter configuration option is preferred because it hides reasonably sophisticated proxy configuration issues from the user. However, the proxy must know which browser is being used.
  • the browser then funnels all WWW requests through the local proxy.
  • the local proxy then takes the browser's WWW request and converts it into an appropriate low-bandwidth optimized protocol for the network being used (e.g., AirBossTM Wireless
  • the remote proxy is capable of receiving the converted script form from the local proxy and
  • the data is encrypted, compressed, filtered based on the original script, and/or encapsulated into an optimized protocol and sent back to the local proxy (these services will be described in more detail in Methods 2 & 3 described below).
  • the local proxy receives the encapsulated response, unpackagos it, and returns the final response to the browser.
  • the web browser 54 outputs a request which is couched in the advanced OSI protocol ayers or application layer protocols 70 which comprises
  • TCP/IP TCP/IP.
  • the request is transmitted to the local proxy
  • the encapsulated request is then submitted via the network access device 58 (e.g., modem) to the low-bandwidth network.
  • the network access device 58 e.g., modem
  • the request traverses the low-bandwidth network to arrive at the generic service node 74.
  • the encapsulated request is then submitted to the remote proxy 66 which translates the encapsulated request from the low-bandwidth optimized protocol (e.g., AirBossTM Transport Protocol) to the application layer protocols originally created by the web browser, and submits the browser's request to the Internet.
  • the low-bandwidth optimized protocol e.g., AirBossTM Transport Protocol
  • Multi-threading refers to a programming/operating system paradigm that allows applications to appear to do several operations at the same time. During development of the present invention, it was discovered that the split proxy should be capable of multi-threading
  • the split proxy should do the same to facilitate seamless integration into the WWW access regime.
  • PCI Personal Communications Internet work
  • request/response pairs is that multiple browsers can be supported on a host by a single local proxy.
  • the main consortium for the WWW, W3C has
  • the proxy software include compression, encryption, and filtering tools in a proprietary regime that still makes use of all of the open nature of the www.
  • the transaction system between the remote and local proxies, including compression and encryption algorithms may be a proprietary system devised by a service provider for the use of its customers.
  • a filtering tool can also be implemented by the split proxy. Filtering, in the context of the present invention, refers to a global control on the low- bandwidth network. For example, when browsers submit a request for information, they generally do not know how much information is going to be retrieved.
  • the local proxy receives filtering configuration instructions from the user which are then transmitted to and implemented by the remote proxy. The remote proxy can then perform such functions as examining the response to a user's data request and stopping unduly large data objects, for example, from overwhelming the user's system.
  • encryption and compression algorithms are better placed in between the local proxy and the remote proxy as opposed to placing such capabilities in a new web browser. As noted, such algorithms can then be protected in a proprietary regime.
  • One of ordinary skill in the art could easily design encryption and compression algorithms based on well-known principles for any service provider desiring a unique set of algorithms.
  • Interoperability allows different producers of proxies to make remote and local proxies that function together. This also allow manufacturers of different computer platforms to bridge their platforms with others.
  • a script to implement compression, encryption and filtering, whether proprietary or open, should include fields to do at least the following:
  • compression choice should be based on the type of data contained in the script).
  • LZW compression algorithms can be used on textual data.
  • C Support at least negative filters or positive filters.
  • filtering algorithms can be used:
  • Negative filters - A response script should not include any binary data or a response script should not be greater than this size.
  • the transaction system between the local and remote proxies must be able to respond appropriately. For example, if the script cannot be submitted to the wireless network, or the script fails to get to the remote proxy, or the remote proxy is incapable of getting access to the Internet, the
  • the service provider may instead distribute new updated software, if the user is operating on a large scale, implementing an update may even require a service technician dispatched to reinstall the software, reconfigure the software, and troubleshoot it.
  • the customer may have to call a customer support line and wait for verbal instructions to support installation of the update.
  • a simpler and more efficient solution is provided by a service provider using the split proxy interface.
  • the service provider can access the user's WWW access software on the user's own system and immediately install, configure or update that software. This method may also
  • the solution of the present invention is to
  • the local proxy should be running constantly in the background of the user's system to receive and implement such communications, even if the web browsing software is not running.
  • the present invention was designed to be small and modular to limit the amount of system resources. This feature protects against
  • FIG. 5 a flow diagram of the present invention will be described.
  • the flow diagram of Fig. 5 has a series of entities listed at the top corresponding to the main components of the present invention, including the web browser 54, the local proxy 56, the remote proxy 66, and the external web server of the WWW 68.
  • the flow diagram illustrates the
  • the web browser 54 and the local proxy 56 are designed to run co-resident on the same host computer or user terminal 52.
  • the remote proxy 66 and the external web server do not necessarily need to be coresident.
  • the remote proxy 66 must only be able to access and communicate with the external web server.
  • the arrows in Fig. 5 represent communication or transfer of data from one entity to another.
  • the arrow heads specify the direction in which the action is directed.
  • the lines from top to bottom represent the timeline and the sequence with which the process steps occur.
  • the first flow shown in Fig. 5 is the start-up flow. This is basically how the system is activated on the end user's host computer. It is assumed that the remote proxy and the external web server are already running in all of these flow descriptions (those systems can be maintained and started by a system administrator with no interaction from the end user's point of view). The first action that occurs is that the end user starts the local proxy. That simply means launching an
  • the operating system can be, for example, the WindowsTM Version 3.1 operating system.
  • the local proxy After the local proxy is started, the local proxy has two responsibilities. If the browser type is specified on the user's host computer, the local proxy should configure and start the browser. Some browsers must be configure before they are launched, while other browsers must be launched first and then configured. This is dependent on which browser type is being used.
  • the browser can be any conventional browser type that supports proxy services.
  • the end user will have to launch and configure the browser manually for the local proxy, in this case, the end user must know enough information about the web browser that he is using to be able to manually configure it for proxy services.
  • the second flow shown on Fig. 5 is a general browser usage flow.
  • This flow shows the process steps of the present invention after the browser has been started and configured.
  • the end user first submits a standard web request. That basically means the user points and clicks on a hyperlink or opens up a dialog box and enters what is typically called a universal resource locator (URL). For example, this is how the Internet community identifies and accesses data objects on the www.
  • URL universal resource locator
  • the next step in the flow for the general browser usage is that the query launched from the browser is submitted to the local proxy.
  • the local proxy creates a query script, and places settings in that script
  • the local proxy also places settings in the script for the filters and the encryption type to be applied to that data object. The settings provide security and also give the user control of the information that will be returned in response to the query.
  • the remote proxy parses the query script and extracts the packaged query that was
  • the remote proxy then executes the query in a standard web data object request.
  • the external web server after receiving the query, will return the appropriate data object associated with the query. No other special enhancements are needed at that point. That is just a traditional client to server request on the computer network that can use any
  • WWW protocols For example, hypertext transfer protocol, file transport protocol, simple mail transport protocol, or post office protocol can be used.
  • the remote proxy After the data object has been returned to the remote proxy, the remote proxy applies the compression, filters, and encryption that were specified in the original query script. Those include the actions to be run on the data object to put the data object into the correct form for delivery to the local proxy.
  • the compression, filters, and encryption are formulated into a reply script.
  • the local proxy matches the reply script with the request script. Once the reply script is matched with the request script, it will know the appropriate browser and place to deliver that
  • the local proxy than parses through the reply script and extracts the internal data object. Thus, two things need to happen with the reply script in the local proxy.
  • the reply script must be matched with the request, and the local proxy must extract the data object out and deliver it to the appropriate place in the operating system so that the browser can display the object in its viewer.
  • the third flow shown in Fig. 5 is a service update or a service script flow.
  • This is a situation where a network administrator that is interested in implementing updated services would be able to remotely from within the network configure an end user's host system.
  • the remote proxy creates a service script. For example, if a new HTML home page is to be delivered and configured on the end user's remote system, a service script would be created that instructs the local proxy to write an HTML file into the distribution.
  • the service script would contain the HTML page as the data object and once the script is completed in an appropriate form, it would be delivered to the local proxy.
  • the local proxy has a responsibility of parsing through the service script, pulling out both the action and any associated data objects with that action, and completing the requested action. So, to finish the example, the local proxy would parse through to find out what action was requested (writing a new HTML home page), extract the data object (a new HTML home page), and then write the data object to the local file
  • the arrow indicates that it is sometimes appropriate to display information into the browser.
  • the local proxy will display dialog boxes or other user interface notification of appropriate actions.
  • the browsers that are capable of receiving asynchronous updates can be notified at that point, and the local proxy will initiate that action and send any appropriate user interface controls to the browser to display to the user the actions that have just been executed on the local host system.
  • the interface between a user and the www provided by the present invention provides protocol translation, compression, encryption, filtering and automatic service updates that results in a much improved connection to this extremely valuable resource.
  • the present invention provides a way for a network administrator to directly manage a customer's host configuration, foregoing less reliable technical support lines to troubleshoot problems or requiring the customer to learn sophisticated settings for software. Also, new service deployment is automated by the present
  • the technology embodied in the present invention is most suitable for use by ISPs, manufacturers of PDAs and Laptops, Wireless Network Providers, Wireless System
  • the technology can also be integrated with other product lines to enhance projects that have strong ties to the WWW and have mobility components.

Abstract

Interface entre un ordinateur protégé ou un réseau d'ordinateurs (52) et le réseau mondial Internet (WWW) (68). L'interface comporte un système PROXY (56, 66) en deux parties qui encapsule les transmissions TCP/IP dans un script de transmission qui évite les problèmes rencontrés avec les systèmes à latence élevée et qui, de ce fait, améliore considérablement les accès au WWW, via un modem sans fil ou un autre type de réseau de communication à bande passante étroite. L'interface en deux parties (56, 66) fournit aussi les services de compression, de chiffrement et de filtrage permettant au prestataire de services d'acheminer certaines transmissions non sollicitées dans le but, par exemple, de procéder automatiquement aux mises à jour ou à la configuration du logiciel d'accès WWW.
PCT/US1996/003909 1996-03-22 1996-03-26 Systeme proxy distant et procede WO1997035402A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AU55256/96A AU707755B2 (en) 1996-03-22 1996-03-26 Remote proxy system and method
CA002247536A CA2247536C (fr) 1996-03-22 1996-03-26 Systeme proxy distant et procede
EP96912438A EP0885501A4 (fr) 1996-03-22 1996-03-26 Systeme proxy distant et procede
JP9533423A JPH11507152A (ja) 1996-03-22 1996-03-26 リモート・プロキシ・システムおよび方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/614,612 1996-03-22
US08/614,612 US5673322A (en) 1996-03-22 1996-03-22 System and method for providing protocol translation and filtering to access the world wide web from wireless or low-bandwidth networks

Publications (1)

Publication Number Publication Date
WO1997035402A1 true WO1997035402A1 (fr) 1997-09-25

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PCT/US1996/003909 WO1997035402A1 (fr) 1996-03-22 1996-03-26 Systeme proxy distant et procede

Country Status (9)

Country Link
US (1) US5673322A (fr)
EP (1) EP0885501A4 (fr)
JP (2) JPH11507152A (fr)
KR (1) KR100372403B1 (fr)
CN (1) CN1155197C (fr)
AU (1) AU707755B2 (fr)
CA (2) CA2355318A1 (fr)
TW (1) TW388158B (fr)
WO (1) WO1997035402A1 (fr)

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WO1999035778A2 (fr) * 1998-01-07 1999-07-15 Microsoft Corporation Filtrage de contenu bas niveau
WO2000019736A1 (fr) * 1998-09-25 2000-04-06 Soma Networks, Inc. Systeme d'exploitation pour communications
EP1047240A2 (fr) * 1999-03-29 2000-10-25 International Business Machines Corporation Méthode et appareil pour la répresentation d'objects dans un réseau
GB2358776A (en) * 1999-12-18 2001-08-01 Roke Manor Research Applying TCP congestion control to a wired portion of a communication path, but not to a wireless portion of the path
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CN1155197C (zh) 2004-06-23
KR20000064635A (ko) 2000-11-06
EP0885501A1 (fr) 1998-12-23
TW388158B (en) 2000-04-21
AU707755B2 (en) 1999-07-22
EP0885501A4 (fr) 2005-04-13
CA2247536C (fr) 2001-10-09
US5673322A (en) 1997-09-30
JPH11507152A (ja) 1999-06-22
CA2247536A1 (fr) 1997-09-25
KR100372403B1 (ko) 2003-06-18
JP2003233541A (ja) 2003-08-22
CA2355318A1 (fr) 1997-09-25
CN1215518A (zh) 1999-04-28
AU5525696A (en) 1997-10-10

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